颅脑梯度回波成像: 呼吸伪影和导航回波矫正

波谱学杂志

颅脑梯度回波成像: 呼吸伪影和导航回波矫正

董芳，裴孟超，王前锋，姜宏伟，李建奇*?

上海市磁共振重点实验室，华东师范大学物理系，上海 200062

收稿日期:2013-08-12 修回日期:2014-07-18 出版日期:2014-09-05 发布日期:2014-09-05
作者简介:董芳(1988-)，女，浙江人，硕士研究生，研究方向为核磁共振成像方法和应用． *通讯联系人：李建奇，电话：021-62223871, E-mail：jqli@phy.ecnu.edu.cn.
基金资助:
国家自然科学基金资助项目(81271533)．

Respiration-Induced Artifacts and Navigator Echo Correction in Gradient Echo Imaging on Human Brain

DONG Fang，PEI Meng-chao，WANG Qian-feng，JIANG Hong-wei，LI Jian-qi*

Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China

Received:2013-08-12 Revised:2014-07-18 Online:2014-09-05 Published:2014-09-05
About author:LI Jian-qi, Tel: 021-62223871, E-mail: jqli@phy.ecnu.edu.cn.
Supported by:
国家自然科学基金资助项目(81271533)．

摘要/Abstract

摘要：

梯度回波序列是磁共振成像中常用的脉冲序列，然而梯度回波对主磁场波动非常敏感，呼吸等生理运动引起的信号波动会导致图像伪影．该文报道了采用导航回波技术获取呼吸运动导致的局部磁场波动，用以矫正图像回波中随时间变化的相位波动，并将该技术应用于三维多回波梯度回波成像和T₂^* 定量图研究．研究结果显示：矫正前，相位波动幅度随回波时间增长而增大，模图和T₂^* 定量图在相位编码方向有明显伪影，并且男女呼吸伪影水平有显著性差异；矫正后，相位波动幅度大幅下降，图像伪影水平有显著性下降．

关键词: 磁共振成像(MRI), 呼吸伪影, 导航回波, 三维多回波梯度回波, T₂^* 定量图

Abstract:

Images acquired with gradient echo sequences are susceptible to artifacts induced by frequency offsets varying in spatial and temporal dimensions. This study addressed how respiration-induced local field fluctuations affect the quality of brain images acquired with a three-dimensional multi-echo gradient echo sequence. It was shown that respiration-related artifacts can be corrected by acquire a one-dimensional navigator signal before the application of phase-encoding gradient in each phase-encoding step, which later can be used to correct respiration-related phase shifts during reconstruction to yield
artifact-free images. Experimental results showed that both the respiration-related phase oscillations and image artifacts increased with echo time. It was also demonstrated that the phase fluctuations and image artifact levels in both the gradient echo images and T₂^* maps calculated from mutli-echo data reduced significantly after navigator echo phase correction.

Key words: MRI, respiratory induced artifacts, navigator echo, gradient echo, T₂^* mapping

中图分类号:

O482.53

董芳，裴孟超，王前锋，姜宏伟，李建奇*. 颅脑梯度回波成像: 呼吸伪影和导航回波矫正[J]. 波谱学杂志.

DONG Fang，PEI Meng-chao，WANG Qian-feng，JIANG Hong-wei，LI Jian-qi*. Respiration-Induced Artifacts and Navigator Echo Correction in Gradient Echo Imaging on Human Brain[J]. Chinese Journal of Magnetic Resonance.

参考文献

[1] Frahm J, Haase A, Matthaei D. Rapid NMR imaging of dynamic processes using the FLASH technique [J]. Magn Reson Med 1986, 3(2): 321－327.

[2] Rauscher A, Sedlacik J, Barth M, et al. Magnetic susceptibility-weighted MR phase imaging of the human brain [J]. AJNR Am J Neuroradiol, 2005, 26(4): 736－742.

[3] Duyn J H, van Gelderen P, Li T Q, et al. High-field MRI of brain cortical substructure based on signal phase [J]. Proc Natl Acad Sci USA, 2007, 104(28): 11 796－11 801.

[4] Fukunaga M, Li T Q, van Gelderen P, et al. Layer-specific variation of iron content in cerebral cortex as a source of MRI contrast [J]. Proc Natl Acad Sci USA, 2010, 107(8): 3 834－3 839.

[5] Grabner G, Dal-Bianco A, Schernthaner M, et al. Analysis of multiple sclerosis lesions using a fusion of 3.0 T FLAIR and 7.0 T SWI phase: FLAIR SWI [J]. J Magn Reson Imag, 2011, 33(3): 543－549.

[6] Haacke E M, Makki M, Ge Y, et al. Characterizing iron deposition in multiple sclerosis lesions using susceptibility weighted imaging[J]. J Magn Reson Imag, 2009, 29(3): 537－544.

[7] Lotfipour A K, Wharton S, Schwarz S T, et al. High resolution magnetic susceptibility mapping of the substantia nigra in Parkinson's disease[J]. J Magn Reson Imag, 2012, 35(1): 48－55.

[8] Zhang J, Zhang Y, Wang J, et al. Characterizing iron deposition in Parkinson's disease using susceptibility-weighted imaging: an in vivo MR study [J]. Brain Res, 2010, 1330: 124－130.

[9] Zhang W, Sun S G, Jiang Y H, et al. Determination of brain iron content in patients with Parkinson's disease using magnetic susceptibility imaging [J]. Neurosci Bull, 2009, 25(6): 353－360.

[10] Zhu W Z, Zhong W D, Wang W, et al. Quantitative MR phase-corrected imaging to investigate increased brain iron deposition of patients with Alzheimer disease [J]. Radiology, 2009, 253(2): 497－504.

[11] Klassen L M, Menon R S. Robust automated shimming technique using arbitrary mapping acquisition parameters (RASTAMAP) [J]. Magn Reson Med, 2004, 51(5): 881－887.

[12] Wowk B, McIntyre M C, Saunders J K. k-Space detection and correction of physiological artifacts in fMRI [J]. Magn Reson Med, 1997, 38(6): 1 029－1 034.

[13] Henry P G, van de Moortele P F, Giacomini E, et al. Field-frequency locked in vivo proton MRS on a whole-body spectrometer [J]. Magn Reson Med, 1999, 42(4): 636－642.

[14] Hu X, Kim S G. Reduction of signal fluctuation in functional MRI using navigator echoes [J]. Magn Reson Med, 1994, 31(5): 495－503.

[15] Glover G H, Li T Q, Ress D. Image-based method for retrospective correction of physiological motion effects in fMRI: RETROICOR [J]. Magn Reson Med, 2000, 44(1): 162－167.

[16] Triantafyllou C, Hoge R D, Wald L L. Effect of spatial smoothing on physiological noise in high-resolution fMRI [J]. Neuroimage, 2006, 32(2): 551－557.

[17] van Gelderen P, de Zwart J A, Starewicz P, et al. Real-time shimming to compensate for respiration-induced B0 fluctuations [J]. Magn Reson Med, 2007, 57(2): 362－368.

[18] Raj D, Paley D P, Anderson A W, et al. A model for susceptibility artefacts from respiration in functional echo-planar magnetic resonance imaging [J]. Phys Med Biol, 2000, 45(12): 3 809－3 820.

[19] Van de Moortele P F, Pfeuffer J, Glover G H, et al. Respiration-induced B0 fluctuations and their spatial distribution in the human brain at 7 Tesla [J]. Magn Reson Med, 2002, 47(5): 888－895.

[20] Ericsson A, Weis J, Hemmingsson A, et al. Measurements of magnetic field variations in the human brain using a 3D-FT multiple gradient echo technique [J]. Magn Reson Med, 1995, 33(2): 171－177.

[21] Huang Min(黄敏), Cheng Jun-bo(陈军波), Xiong Qiong(熊琼), et al. Comparison and implementation of commonly-used image reconstruction algorithms in parallel MRI(并行MRI 图像重建算法比较及软件实现) [J]. Chinese J Magn Reson(波谱学杂志), 2011, 28(1): 99－108.

[22] Wang Qian-feng(王前锋), Li Jian-qi(李建奇), Wu Dong-mei(吴东梅). Implementation of high resolution diffusion weighted imaging of small animal in clinical MRI system(小动物高分辨扩散加权成像在临床MRI上的实现) [J]. Chinese J Magn Reson(波谱学杂志), 2012, 29(3): 372－378.

[23] Jiang Xiao-ping(姜小平), Li Jian-qi(李建奇), Fan Ming-xia(范明霞). Line-scan diffusion tensor imaging on low field strenth MRI scanner(低场MRI 系统中线扫描扩散张量成像方法的研究) [J]. Chinese J Magn Reson(波谱学杂志), 2008, 25(4): 470－477.

[24] Chen Wei-bo(陈伟波), Li Jian-qi(李建奇), Jiang Xiao-ping(姜小平). Implementation of self-navigated motion correction fast spin echo technique at Low field MRI system(自导航快速自旋回波在低场MRI 上的实现) [J]. Chinese J Magn Reson(波谱学杂志), 2009, 26(2): 197－205.

[25] Peeters J M, Fuderer M. SENSE with improved tolerance to inaccuracies in coil sensitivity maps [J]. Magn Reson Med, 2013, 69(6): 1 665－1 669.

[26] Yao B, Li T Q, Gelderen P, et al. Susceptibility contrast in high field MRI of human brain as a function of tissue iron content [J]. Neuroimage, 2009, 44(4): 1 259－1 266.

[27] Denk C, Rauscher A. Susceptibility weighted imaging with multiple echoes [J]. J Magn Reson Imag, 2010, 31(1): 185－191.

[28] Gilbert G, Savard G, Bard C, et al. Quantitative comparison between a multiecho sequence and a single-echo sequence for susceptibility-weighted phase imaging [J]. Magn Reson Imag, 2012, 30(5): 722－730.

[29] Luo J, Jagadeesan B D, Cross A H, et al. Gradient echo plural contrast imaging-signal model and derived contrasts: T₂^*, T₁, Phase, SWI, T1f, FST₂^* and T₂^*-SWI [J]. Neuroimage, 2012, 60(2): 1 073－1 082.

[30] Liu T, Surapaneni K, Lou M, et al. Cerebral microbleeds: Burden assessment by using quantitative susceptibility mapping[J]. Radiology, 2012, 262(1): 269－278.

[31] Schweser F, Deistung A, Lehr B W, et al. Quantitative imaging of intrinsic magnetic tissue properties using MRI signal phase: An approach to in vivo brain iron metabolism? [J]. Neuroimage, 2011, 54(4): 2 789－2 807.

[32] Feng W, Neelavalli J, Haacke E M. Catalytic multiecho phase unwrapping scheme (CAMPUS) in multiecho gradient echo imaging: Removing phase wraps on a voxel-by-voxel basis [J]. Magn Reson Med, 2013, 70(1): 117－126.